test: core: add bstr tests; update rope tests

test/core/streams.c

@@ -1,3 +1,4 @@
+#include <blue/core/bstr.h>
 #include <blue/core/stream.h>
 #include <stdio.h>
 
@@ -6,5 +7,15 @@ int main(void)
 	b_stream_read_line_s(b_stdin, b_stdout);
 	b_stream_write_char(b_stdout, '\n');
 
+	char s[16];
+	b_bstr str;
+	b_bstr_begin(&str, s, sizeof s);
+
+	b_stream_read_line_s(b_stdin, (b_stream *)&str);
+	b_stream_write_char((b_stream *)&str, '\n');
+
+	const char *e = b_bstr_end(&str);
+	fputs(e, stdout);
+
 	return 0;
 }